These were fun to make. We used ready-made Rice Krispie bars. The green icing is the result of a Google search for "cookie icing that hardens." It's the one that uses corn syrup, not the one called Royal Icing. Randy added the hair (sprinkles) right after I spread the green icing, since it sets up fairly quickly. Then, I used the little icing tubes from the grocery store for the eyes, mouth, and scar.
The kidlets picked out pumpkins.
A good time was had by all.